Alleged Baby Murderer Casey Anthony -- Accused of Stiffing Uncle Sam

Alleged Baby Killer Casey Anthony -- The $68,000 Bill

5/26/2011 10:12 AM PDT BY TMZ STAFF

Accused child murderer Casey Anthonyis in more hot water with the feds -- the I.R.S. believes she failed to pay $68k in taxes back in 2008 ... the same year she allegedly killed her 2-year-old daughter.

TMZ obtained a tax lien filed against Anthony in Florida last week -- and according to the document, Casey never forked over $68,520 in federal taxes in 2008.

Casey was charged with first-degree murder the same year -- and is currently on trial in Orlando, FL ... facing the death penalty if convicted.

HERE'S THE RUNDOWN Meredith Viera Defends the Killer of Cecil the Lion Jennifer Beals in a Hot-Dog-in-Car Controversy A 'Bachelorette' Star Gets Bashed in the Head with a Brick Zayn Malik is Goin' Solo Thanks to Simon Cowell